WM8727 データシートの表示（PDF） - Wolfson Microelectronics plc
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WM8727 Datasheet PDF : 16 Pages
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WM8727
Production Data
ELECTRICAL CHARACTERISTICS
Test Conditions
VDD = 5V, GND = 0V, TA = +25oC, fs = 48kHz, MCLK = 256fs unless otherwise stated.
PARAMETER
SYMBOL TEST CONDITIONS
MIN
Digital Logic Levels (TTL Levels)
Input LOW level
VIL
Input HIGH level
VIH
2
Output LOW
VOL
IOL = 2mA
Output HIGH
VOH
DAC Output (Load = 10kΩ 50pF)
IOH = 2mA
0.9 x VDD
0dBFs Full scale output voltage
At DAC outputs
SNR (Note 1,2)
SNR (Note 1,2)
SNR (Note 1,2)
SNR (Note 1,2)
SNR (Note 1,2)
SNR (Note 1,2)
THD
Dynamic range (Note 2)
Analogue Output Levels
Output level
Gain mismatch
channel-to-channel
Minimum resistance load
Maximum capacitance load
Output d.c. level
Power On Reset (POR)
POR threshold
A-weighted,
@ fs = 48kHz
A-weighted
@ fs = 96kHz
A-weighted
@ fs = 192kHz
A-weighted,
@ fs = 48kHz
VDD = 3.3V
A-weighted
@ fs = 96kHz
VDD = 3.3V
Non ‘A’ weighted @ fs
= 48kHz
1kHz, 0dBFs
1kHz, THD+N @
-60dBFs
Load = 10kΩ, 0dBFS
Load = 10kΩ, 0dBFS,
(VDD = 3.3V)
To midrail or a.c.
coupled
To midrail or a.c.
coupled
(VDD = 3.3V)
5V or 3.3V
TYP
1.2 x
VDD/5
98
95
92
95
95
92
-84
98
1.2
0.79
±1
1
1
100
VDD/2
1.8
MAX
0.8
0.10 x VDD
UNIT
V
V
V
V
VRMS
dB
dB
dB
dB
dB
dB
dB
dB
VRMS
VRMS
%FSR
kΩ
kΩ
pF
V
V
Notes:
1. Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured ‘A’ weighted
over a 20Hz to 20kHz bandwidth.
2. All performance measurements done with 20kHz low pass filter, and where noted an A-weight filter. Failure to use such a
filter will result in higher THD+N and lower SNR and Dynamic Range readings than are found in the Electrical
Characteristics. The low pass filter removes out of band noise; although it is not audible it may affect dynamic specification
values.
3. Power down occurs 1.5µs after MCLK stops.
w
PD Rev 4.1 April 2004
5
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